Strange acceleration without pedal
This is a bit of a difficult one to describe...
From cold, in gear, and after setting off, my 3.2 V6 Brera seems to be trying to accelerate even when I take my foot off the pedal. If I am approaching a junction, and take my foot off the gas, the car continues to accelerate and revs remain up. I obviously brake but the car seems to be straining against the brake as if it is accelerating at the same time. When I come to a stop with my foot on the brake and clutch, the revs shoot up before they drop. There have been a few hairy moments as you can imagine.
This strange effect seems to largely stop after just a minute or so of driving, although a slight rev surge when brake/clutch stopping sometimes reappears.
Any ideas? I've had this issue for a year or more, and I've had the clutch and DMF replaced recently so I don't think it can be clutch-related. I'm guessing a throttle position sensor issue or something? Strange that it only happens from absolute cold - so only first thing in the morning on the way to work, not on a return journey. No EML or error codes or anything like that.
Note, I also have gearbox problems (awkward 1st/2nd, crunchy 3rd), general underperformance, and a rattly engine on idle. I am not sure if there is any connection. This car has just been one thing after another.